Portrait: Ralph Walker (fl. late 18th century), engineer and bridge designer. Stipple engraving by William Ridley after John Eckstein, 1803. Pub by Jas. Asperne 32, Cornhill Decr 1, 1803. Print, engraving, stipple 22x14cm., platemark 16.2x11.1cm. Plate from the European Magazine. Portrait, HL, seated, wearing spectacles